I didn't get this at a quilt show, but it is my favorite ruler. Called the 24" ruler with adjustable locking fabric guide. Just love it, love it. Only sad thing is I picked it up one day by one day by the end and it snapped off. Still works though as the screw that holds the adjustable part held. Will see if I can't tape it back together one day. can be found at
www.quiltersrule.com the most expensive ruler I have bought, but has really been worth it to me.